The transformer use to be available from newark, but it seems to have disappeared from their online store.
Anyway, the transformer is a mini-audio transformer, and can be hooked up similar to any other semiconductor, with this one the pins are like that of a transistor/capacitor/etc. They come out of the bottom and are roughly 1 inch in length, just get the spacing, then transfer it to a PCB, or if you're using perfboard, just insert the transformer and solder it down.
The design of this particular stungun requires you only use 4 of the pins on this model (which has 5 I believe) on one side there are 3 on this design this is the secondary (Being a 200K-1K, when used in reverse it's kinda like a 1K-200K, only it doesn't have 1K of voltage going to it, so it results in about 2KV) and the other side, the primary has 2 pins, which are soldered to the board, then to 2 wires, and the wires are soldered to 2 electrodes (you can use 2 small nails, the kind you hang pictures with work well since they have a fairly sharp point and can penetrate clothing)
Does this answer you're question ? If not I can elaborate on anything that's still fuzzy.